Measure of Nervous System Integrity

The researchers tested forty florid subjects: ten young males, ten young females, ten grey males, and ten old females (1:72). Older subjects were chosen whose physical body process history was similar to that of the younger subjects (1:72).

Each subject underwent robotlike ( power throbbing drop) stimulation of the Achilles tendon involuntary (T) and electrical stimulation of its analogue, the Hreflex of the calf muscles (1:71). The responses were measured electronically (1:73). M and H waves of the reflex muscle action potential (MAP) response were employ to evaluate motoneuron excitability (1:74). Changes with age in the H and T reflexes were then compared (1:75).

What DeVries et al. lay out was a " infinitesimal and nonsignificant difference" between the quondam(a) and younger subjects in the amplitude of the MAP elicited by the Achilles tendon reflex (1:77). They did note though, that the stimulus value for a given hammer drop might have been higher in the senior subjects due to possible decrease elasticity of their Achilles tendons (1:77). Such decreased elasticity might result in a greater rate of stretch for the older subjects' muscle spindles and, therefore, elicit a greater response (1:78).

In addition, the T reflex was found to be absent in only one of the older subjects; furthermore, in that subject it was absent at the lowest hammer drop height (1:78). Thus, the study concluded that areflexia with res

pect to the T reflex is somewhat less public than had been reported (1:78). Previous research may have compared inactive elderly with active young subjects.

The result could have been inaccuracy regarding ascertained frequencies of areflexia.

Koceja offered a event of explanations as to why attenuated biased reflexes were found in the older group. For example, motoneuron excitability may change with age (3:248). He as well as speculated that lower blackjack output in the older subjects was due to loss of operational motor units (3:248). In addition, agerelated changes may also have occurred in the older subjects' muscle spindles (3:249). It has been documented, for example, that the elderly reckon a slight decline in intrafusal fiber number (3:249). Each of these hypotheses seem adequate.

The results for contralateral conditioning showed a close to different recovery profile from the ipsilateral profile for both(prenominal) groups (3:247). Facilitation occurred in both the older and younger group at early latencies (3:247).

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